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From:	Nikolay Melekhin <nikolay DOT melekhin AT gmail DOT com>
Date:	Tue, 12 Sep 2017 08:38:07 +0300
Message-ID:	<CAAq9174TrUGOr+y4GvMWEqNXao-zyemptuoSM8_Jna33qwpjiw@mail.gmail.com>
Subject:	Re: Extra CR symbol from backticks on Cygwin 2.9.0
To:	Eric Blake <eblake AT redhat DOT com>
Cc:	cygwin AT cygwin DOT com

Hi Eric,

Thanks! This option is what I am looking for.
However I cannot agree with you on bash behavior in Cygwin. Section of
command substitution in bash documentation says:

https://www.gnu.org/software/bash/manual/bash.html#Command-Substitution

"...with any trailing newlines deleted." That is why I expected that
bash should remove trailing newlines in command substitution results,
which are CRLF on Windows.
From my point of view, bash in Cygwin should follow the same rule on
Linux and Windows: remove trailing newlines in command substitution.
So remove trailing CRLF on Windows.


Best regards,
Nikolay Melekhin

2017-09-12 1:00 GMT+03:00 Eric Blake <eblake AT redhat DOT com>:
> On 09/11/2017 04:27 PM, Nikolay Melekhin wrote:
>>
>> I'd expect that Cygwin must remove CRLF symbols from backtick results,
>
> You expected wrong - by default Cygwin does the same as Linux, which
> does NOT remove CR from command substitution (only LF).
>
>> but remove only LF symbol. It gets different results on Windows and
>> Linux. Result on Windows has additional CR symbol and for example
>> string comparision, which is working in Linux, fails in Windows.
>
> It is NOT a bug in Cygwin, but in your failure to sanitize your input.
> You'd get the same behavior on Linux if you pass in CR bytes.  That said,
>
>>
>> Is any kind of an option/setting which removes such CRs or it is a bug
>> in Cygwin?
>
> Read the release announcements: Cygwin bash DOES have an 'igncr' shell
> option (set -o igncr) that does exactly what you are asking for - it
> makes bash ignore CR characters in command substitutions and other places:
>
> https://cygwin.com/ml/cygwin-announce/2017-01/msg00047.html
>
> The option is not on by default, but exists because it is a common
> desire when you can't be bothered to otherwise sanitize CR out of your
> input stream.
>
> --
> Eric Blake, Principal Software Engineer
> Red Hat, Inc.           +1-919-301-3266
> Virtualization:  qemu.org | libvirt.org
>

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